Optimize chapters mapping

app/src/main/java/org/koitharu/kotatsu/details/ui/MangaDetailsDelegate.kt

@@ -16,7 +16,6 @@ import org.koitharu.kotatsu.parsers.exception.NotFoundException
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaChapter
 import org.koitharu.kotatsu.parsers.model.MangaSource
-import org.koitharu.kotatsu.parsers.util.mapToSet
 import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
 
 class MangaDetailsDelegate(
@@ -84,7 +83,7 @@ class MangaDetailsDelegate(
 		val dateFormat = settings.getDateFormat()
 		val currentIndex = chapters.indexOfFirst { it.id == currentId }
 		val firstNewIndex = chapters.size - newCount
-		val downloadedIds = downloadedChapters?.mapToSet { it.id }
+		val downloadedIds = downloadedChapters?.mapTo(HashSet(downloadedChapters.size)) { it.id }
 		for (i in chapters.indices) {
 			val chapter = chapters[i]
 			if (chapter.branch != branch) {
@@ -99,6 +98,9 @@ class MangaDetailsDelegate(
 				dateFormat = dateFormat,
 			)
 		}
+		if (result.size < chapters.size / 2) {
+			result.trimToSize()
+		}
 		return result
 	}
 
@@ -154,6 +156,9 @@ class MangaDetailsDelegate(
 			}
 			result.sortBy { it.chapter.number }
 		}
+		if (result.size < sourceChapters.size / 2) {
+			result.trimToSize()
+		}
 		return result
 	}
 }

app/src/main/java/org/koitharu/kotatsu/details/ui/model/ChapterListItem.kt

@@ -1,13 +1,24 @@
 package org.koitharu.kotatsu.details.ui.model
 
+import java.text.DateFormat
 import org.koitharu.kotatsu.parsers.model.MangaChapter
 
 class ChapterListItem(
 	val chapter: MangaChapter,
 	val flags: Int,
-	val uploadDate: String?,
+	private val uploadDateMs: Long,
+	private val dateFormat: DateFormat,
 ) {
 
+	var uploadDate: String? = null
+		private set
+		get() {
+			if (field != null) return field
+			if (uploadDateMs == 0L) return null
+			field = dateFormat.format(uploadDateMs)
+			return field
+		}
+
 	val status: Int
 		get() = flags and MASK_STATUS
 
@@ -32,7 +43,8 @@ class ChapterListItem(
 
 		if (chapter != other.chapter) return false
 		if (flags != other.flags) return false
-		if (uploadDate != other.uploadDate) return false
+		if (uploadDateMs != other.uploadDateMs) return false
+		if (dateFormat != other.dateFormat) return false
 
 		return true
 	}
@@ -40,7 +52,8 @@ class ChapterListItem(
 	override fun hashCode(): Int {
 		var result = chapter.hashCode()
 		result = 31 * result + flags
-		result = 31 * result + (uploadDate?.hashCode() ?: 0)
+		result = 31 * result + uploadDateMs.hashCode()
+		result = 31 * result + dateFormat.hashCode()
 		return result
 	}
 
@@ -53,4 +66,4 @@ class ChapterListItem(
 		const val FLAG_DOWNLOADED = 32
 		const val MASK_STATUS = FLAG_UNREAD or FLAG_CURRENT
 	}
-}
+}

app/src/main/java/org/koitharu/kotatsu/details/ui/model/ListModelConversionExt.kt

@@ -1,12 +1,12 @@
 package org.koitharu.kotatsu.details.ui.model
 
+import java.text.DateFormat
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem.Companion.FLAG_CURRENT
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem.Companion.FLAG_DOWNLOADED
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem.Companion.FLAG_MISSING
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem.Companion.FLAG_NEW
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem.Companion.FLAG_UNREAD
 import org.koitharu.kotatsu.parsers.model.MangaChapter
-import java.text.DateFormat
 
 fun MangaChapter.toListItem(
 	isCurrent: Boolean,
@@ -25,6 +25,7 @@ fun MangaChapter.toListItem(
 	return ChapterListItem(
 		chapter = this,
 		flags = flags,
-		uploadDate = if (uploadDate != 0L) dateFormat.format(uploadDate) else null
+		uploadDateMs = uploadDate,
+		dateFormat = dateFormat,
 	)
 }